What is a common material used for coaxial cable insulators?

Coaxial cable insulators are commonly made from materials that possess excellent dielectric properties, which is essential for minimizing signal loss and interference. Polyethylene is widely used in coaxial cables for insulation because it has a low dielectric constant, high durability, and good moisture resistance. This ensures that the electrical signals within the cable are transmitted effectively without significant degradation due to environmental factors.

Silicone is often not used in coaxial cables as its properties are more suitable for other applications, such as sealing or flexible components. PVC, while it can be used in cabling, does not perform as well in terms of dielectric properties compared to polyethylene. Fiberglass is more commonly used as a structural element or reinforcement in some cables but not specifically for insulation. Therefore, polyethylene is preferred for its optimal characteristics in coaxial cable insulators.